Temperature is one of the necessary conditions for the growth and development of all plants. The grape's requirements for temperature are in different periods and require different temperatures. Different varieties have different temperature requirements when they sprout. Generally, when the dormancy period is over, the buds will germinate when the temperature reaches 7.2 degrees. The optimum temperature for germination is 10-12 degrees. The higher the temperature, the faster the germination. The newly sprouting sprouts can tolerate a low temperature of 3-4 degrees below zero when the leaves are not spit. After the leaves are displayed, the shoots begin to grow and the flower buds begin to differentiate. The most suitable temperature during this period is 25-28 degrees. At this time, the temperature is higher than 35°C, which will cause obstacles in metabolism, slow growth when the degree is over 40 degrees, and disease resistance. Decreased, reduced flower bud differentiation. The most suitable temperature during flowering is 25-30 degrees. Below 15 degrees, the pollination is bad, which makes the falling fruit drop later. Grapes require a higher temperature during the ripening period. Under the condition of 30-35 degrees, the fruit grows quickly and the quality is good. Below 20 degrees, the quality is bad. Below 15 degrees, the fruit does not mature normally, and the dendrite accumulation is low. The output of the next year will have a greater impact. Different parts of the plant are different in tolerance to low temperatures. During the dormancy period in winter, fully mature buds can tolerate temperatures below -18-20 degrees Celsius, and perennial branches tend to suffer freezing injury at minus 22 degrees Celsius. Xylem is more susceptible to frost damage than the phloem. Roots generally suffer damage at minus 5-7 degrees, but the degree of low temperature tolerance of roots of different species is also not the same. The roots of red perfume, Royer, Helena, and Comber are at a safety critical temperature of minus 8 degrees, causing death. The temperature is minus 11 degrees. The Betagen system is able to withstand temperatures of minus 11 degrees Celsius, with a lethal temperature of minus 14 degrees. The branch of the mountain grape can withstand the low temperature of minus 40-50 degrees, and the root system can tolerate the low temperature of -16 degrees below zero. The lethal temperature is below 18-20 degrees.
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